| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 81 |
6.1%
|
| 2 | Difficult | 123 |
9.3%
|
| 3 | Possible | 220 |
16.6%
|
| 4 | Easy | 283 |
21.4%
|
| 5 | Very easy | 618 |
46.6%
|